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The pressure coil of a dynamometer type wattmeter is
- a)Highly inductive
- b)Highly resistive
- c)Purely resistive
- d)Purely inductive
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The pressure coil of a dynamometer type wattmeter isa)Highly inductive...
Electrodynamometer instrument as a wattmeter:
- An electrodynamometer instrument can be used as a wattmeter to measure power
- Two fixed coils are connected in series with the load are called current coils; These will carry a full load current IL as shown in the figure
- The moving coil is connected across the supply is called a voltage coil (or) pressure coil, which will carry a current IP as shown in the figure
- Both coils are connected in parallel so that two different currents will flow through the coils IL and IP respectively
In order to measure the AC power using this meter, we have to consider two assumptions inside the meter.
- The supply voltage is equal to load voltage that means a drop in the current coil is neglected
- The pressure coil is assumed to be purely and highly resistive in nature
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The pressure coil of a dynamometer type wattmeter isa)Highly inductive...
Pressure Coil of a Dynamometer Type Wattmeter
Pressure coil of a dynamometer type wattmeter is highly resistive.
Explanation:
What is a Dynamometer Type Wattmeter?
A dynamometer type wattmeter is an instrument used to measure the power in an electrical circuit. It consists of two coils - a current coil and a pressure coil. The current coil is connected in series with the circuit, while the pressure coil is connected in parallel.
Pressure Coil Characteristics:
1. Highly Resistive: The pressure coil of a dynamometer type wattmeter is designed to have a high resistance. This is because the pressure coil is connected in parallel to the circuit being measured, and it needs to have a high impedance to ensure accurate power measurement without affecting the circuit being measured.
2. Low Inductance: Unlike the current coil which is highly inductive, the pressure coil has low inductance. This is because inductive components can introduce errors in power measurement due to their reactive nature. By keeping the inductance low in the pressure coil, the accuracy of the wattmeter is improved.
3. Highly Damped: The pressure coil is also designed to be highly damped. Damping is necessary to prevent oscillations and ensure fast response time of the wattmeter.
In conclusion, the pressure coil of a dynamometer type wattmeter is highly resistive, low inductance, and highly damped to ensure accurate and reliable power measurement in electrical circuits.
Pressure coil of a dynamometer type wattmeter is highly resistive.
Explanation:
What is a Dynamometer Type Wattmeter?
A dynamometer type wattmeter is an instrument used to measure the power in an electrical circuit. It consists of two coils - a current coil and a pressure coil. The current coil is connected in series with the circuit, while the pressure coil is connected in parallel.
Pressure Coil Characteristics:
1. Highly Resistive: The pressure coil of a dynamometer type wattmeter is designed to have a high resistance. This is because the pressure coil is connected in parallel to the circuit being measured, and it needs to have a high impedance to ensure accurate power measurement without affecting the circuit being measured.
2. Low Inductance: Unlike the current coil which is highly inductive, the pressure coil has low inductance. This is because inductive components can introduce errors in power measurement due to their reactive nature. By keeping the inductance low in the pressure coil, the accuracy of the wattmeter is improved.
3. Highly Damped: The pressure coil is also designed to be highly damped. Damping is necessary to prevent oscillations and ensure fast response time of the wattmeter.
In conclusion, the pressure coil of a dynamometer type wattmeter is highly resistive, low inductance, and highly damped to ensure accurate and reliable power measurement in electrical circuits.
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